And those things happened because the Federalists were wrong, and the Anti-Federalists were right. The central government WAS too powerful, and the mechanisms of restraint WERE too weak. Re-read the Anti-Federalist writings---in light of today's events, they are frighteningly prophetic--especially the sections on the excessive power of the courts.
Although the Federalists ceased to exist AS A POLITICAL PARTY, their political heritage lived on in the structure of the Constitution (as did the heritage of the Anti-Federalists in the Bill of Rights). Time has proven that the restrictions added by the Bill of Rights were insufficient to overcome the deficiencies embedded in the Constitution. Would that more of that structure had been influenced by the Anti-Federalists, rather than just the BoR.
Those things passed because the nation succumbed to the temptations of direct democracy and of marxist levelling.